Section 164(b) in The Orissa Building and Others Construction Workers (Regulation of Employment and Conditions of Service) Rules, 2002
(b)(i)doors of man-locks at an excavation or tunneling work are made of steel.(ii)men-locks used at a tunneling work are airtight and devices are provided for sealing the doors when such locks are under pressure,(iii)the anchorage of a man-lock used at tunneling work have adequate strength to withstand the pressure exerted by air on the man-lock,(iv)there is adequate room available for the building worker for working in the man-lock used at tunneling work,(v)where work is carried out in any compressed air tunnel, a man-lock in accordance with the relevant national standards is used for such tunnel,
